<template>
  <view>
    <my-search @click='gotoSearch'></my-search>
    <view class="scroll-view-container">
      <!-- 左 -->
      <scroll-view scroll-y="true" class="left-scroll-view" :style="{height:wh+'px'}">
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-view-item', index==active?'active':'']" @click="activeChanged(index)">
            {{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">
            /{{item2.cat_name}}/
          </view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotogoodslist(item3)">
              <image :src="item3.cat_icon.replace('dev','web')"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 当前设备可用的高度
        wh: 0,
        // 获取分类列表数据
        cateList: [],
        // 默认的激活项目
        active: 0,
        // 二级分类列表
        cateLevel2: [],
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight-50
      this.getCateList()
    },
    methods: {
      // 获取分类列表数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) {
          return uni.showToast({
            title: '数据请求失败',
            duration: 1500,
            icon: "none"
          })
        }
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(index) {
        this.active = index
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop=this.scrollTop===0?1:0
      },
      // 鼠标点跳转
      gotogoodslist(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_pid
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      },
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;

        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;

          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bolder;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      justify-content: center;
      flex-direction: column;
      align-items: center;
      margin-bottom: 10px;
      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
        
      }
    }
  }
</style>
